[(2.0380+2.0395)/2-(2.032 1+2.0358)/2]* 100%* 12/[(2.032 1+2.0358)/2*3]=0.944%

Specific calculation, according to the direction of exchange:

Spot selling/forward buying, swap rate (premium rate): (2.0395-2.0321) *100% *12/(2.0321* 3) =1.

Spot buying/forward selling, swap rate (premium rate): (2.0380-2.0358) *100% *12/(2.0358 * 3) = 0.432%.